﻿#region Copyright information
// 
// Copyright © 2005-2013 Yongkee Cho. All rights reserved.
// 
// This code is a part of the Biological Object Library and governed under the terms of the
// GNU Lesser General  Public License (LGPL) version 2.1 which accompanies this distribution.
// For more information on the LGPL, please visit http://bol.codeplex.com/license.
// 
// - Filename: Rank.cs
// - Author: Yongkee Cho
// - Email: yongkeecho@gmail.com
// - Date Created: 2012-09-06 11:39 AM
// - Last Modified: 2013-01-25 3:59 PM
// 
#endregion
using System;
using System.Collections.Generic;
using System.Linq;

namespace BOL.Linq.Transformation
{
    public static partial class Scores
    {
        public static IEnumerable<int> Rank<TSource>(this IEnumerable<TSource> source)
            where TSource : IComparable
        {
            var list = source.ToList();
            var distinct = list.OrderBy(x => x).Distinct().ToList();

            return list.Select(x => distinct.IndexOf(x) + 1);
        }

        public static IEnumerable<int> Rank<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> selector)
            where TKey : IComparable
        {
            return source.Select(selector).Rank();
        }
    }
}
